If you're a Verizon Wireless customer, take note: Security experts warn that you have virtually no privacy because of the "supercookies" the company uses to track you. I've got details, as well as ways to protect yourself.

Last year Verizon Wireless began injecting what some people are calling supercookies into Web browsing and app data, using an HTTP header called X-UIDH. Each device gets a unique identifier, which is sent to every unencrypted Web sites each Verizon Wireless customer visits. Unlike normal cookies, they can't be removed. And there's no way to opt out of them. They silently follow wherever you go, so Verizon knows where you go.

You can also try turning on the "Reduce data usage" setting in Mobile Chrome, which may provide some protection, although an ISP can bypass it if it wants to. (For details about how to turn it on, click here.)

Apart from that, your best bet is to complain loud and long about the supercookies -- to Verizon Wireless, to your elected representatives, to the media. Public complaints killed AT&T's similar program. Perhaps they can kill Verizon's as well.

Preston Gralla is a contributing editor for Computerworld and the author of more than 45 books, including Windows 8 Hacks (O'Reilly, 2012) and How the Internet Works (Que, 2006).